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The Rosenblueth phenomenon.

M I Behrens, D Lorenzo, O Fernandez

    Brain Research
    |December 21, 1979
    PubMed
    Summary
    This summary is machine-generated.

    The Rosenblueth Phenomenon, a post-fatigue tension rise in nerves, occurs earlier and is stronger with longer nerve preparations. This suggests increased transmitter release due to axonal transport.

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    Area of Science:

    • Neuroscience
    • Physiology

    Background:

    • The Rosenblueth Phenomenon, a tension rise post-neuromuscular fatigue, was first described in 1939.
    • This phenomenon occurs after prolonged motor nerve stimulation.

    Purpose of the Study:

    • To investigate the Rosenblueth Phenomenon in a cat neuromuscular preparation.
    • To determine the influence of peripheral nerve stump length on the phenomenon's onset and amplitude.

    Main Methods:

    • Cats' nerves were severed at different levels and stimulated at 60 Hz for extended periods.
    • Acetylcholine sensitivity was assessed in the superior cervical ganglion preparation.

    Main Results:

    • Longer peripheral nerve preparations exhibited an earlier onset and higher maximal tension during the Rosenblueth Phenomenon.

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  • No changes in acetylcholine sensitivity were observed during fatigue or the Rosenblueth Phenomenon.

    • Conclusions:

    • The Rosenblueth Phenomenon's onset and amplitude are directly dependent on the length of the peripheral nerve stump.
    • Axonal progression of molecules is suggested as the mechanism, leading to increased transmitter release and the observed phenomenon.